20 ZOOPHYTES. 



vacant, a head in Tarious stages of advancement in each respectively, will 

 be seen a little within the orifice. One which thus presented the tip of 

 the tentacula at noon, protruded part of the disc a few hours later. 



The ascent is sometimes speedy, sometimes slow and gradual. The 

 bud, when near maturity, sometimes appears rather in a spiral form, burst- 

 ing a transparent delicate spath, as it protrudes from the summit of the 

 stem. An internal bud of this description, noted as three lines below the 

 extremity, reached it in three or four days. A nascent tubularia, bred 

 from the cyst, having lost its head, a new bud was some time afterwards 

 discovered, at a third of the length of the stalk from the summit. It 

 flourished through the course of the day following that of observation. 



When the continuity of the pith is interrupted, the vacant part of 

 the stalk becomes of a fine transparent horn colour, which allows the for- 

 mation of a regenerating head, preparing from the upper portion of the 

 internal mass of pith below, to be discerned. This aspect being presented 

 at the distance of an inch from the summit of a stalk, it was sundered 

 near the place, to facilitate the exit of the reproduction, which could not 

 have ascended the original vacuity in vigour. Not only did the bud rise 

 half a line within to the point of this artificial section, but it projected half 

 a line farther. Nevertheless, it went to decay though florid. 



The progressive ascent of the head is demonstrated both by experi- 

 ment and from exposure by the transparency of the stalk. But it can be 

 hardly maintained that the germinating principle is universally diffused 

 amidst the pith, or that the ascent of each regenerating head commences 

 from the lowest part of the root immediately on privation of the original 

 organization. 



However, several regenerations in different early stages may be ad- 

 vancing at once. 



A new shoot in flourish was deeply wounded, almost to separation of 

 the parts. Restored to its element, the head had turned round and the 

 point of adhesion was nearly ruptured. Yet the lacerated parts recovered 

 their natural position, and their edges having applied together, they seemed 

 to have united in forty-eight hours. The head which had previously 

 flourished nine days, fell seventy-two hours after the experiment. The 



